Raymond Hettinger <rhettin...@users.sourceforge.net> added the comment:

Use set.pop().  

Or if you don't want mutation, then use next(iter(s)) or next(iter(s),default). 
  This technique also works for any collection including dicts and deques and 
whatnot.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7212>
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